Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-mutex.hh @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
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1 /*
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2 * Copyright © 2007 Chris Wilson
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3 * Copyright © 2009,2010 Red Hat, Inc.
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4 * Copyright © 2011,2012 Google, Inc.
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5 *
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6 * This is part of HarfBuzz, a text shaping library.
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7 *
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8 * Permission is hereby granted, without written agreement and without
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9 * license or royalty fees, to use, copy, modify, and distribute this
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10 * software and its documentation for any purpose, provided that the
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11 * above copyright notice and the following two paragraphs appear in
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12 * all copies of this software.
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13 *
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14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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18 * DAMAGE.
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19 *
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20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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25 *
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26 * Contributor(s):
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27 * Chris Wilson <chris@chris-wilson.co.uk>
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28 * Red Hat Author(s): Behdad Esfahbod
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29 * Google Author(s): Behdad Esfahbod
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30 */
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32 #ifndef HB_MUTEX_HH
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33 #define HB_MUTEX_HH
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35 #include "hb.hh"
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38 /* mutex */
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40 /* We need external help for these */
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42 #if defined(hb_mutex_impl_init) \
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43 && defined(hb_mutex_impl_lock) \
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44 && defined(hb_mutex_impl_unlock) \
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45 && defined(hb_mutex_impl_finish)
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47 /* Defined externally, i.e. in config.h; must have typedef'ed hb_mutex_impl_t as well. */
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50 #elif !defined(HB_NO_MT) && !defined(HB_MUTEX_IMPL_STD_MUTEX) && (defined(HAVE_PTHREAD) || defined(__APPLE__))
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52 #include <pthread.h>
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53 typedef pthread_mutex_t hb_mutex_impl_t;
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54 #define hb_mutex_impl_init(M) pthread_mutex_init (M, nullptr)
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55 #define hb_mutex_impl_lock(M) pthread_mutex_lock (M)
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56 #define hb_mutex_impl_unlock(M) pthread_mutex_unlock (M)
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57 #define hb_mutex_impl_finish(M) pthread_mutex_destroy (M)
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60 #elif !defined(HB_NO_MT) && !defined(HB_MUTEX_IMPL_STD_MUTEX) && defined(_WIN32)
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62 typedef CRITICAL_SECTION hb_mutex_impl_t;
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63 #if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
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64 #define hb_mutex_impl_init(M) InitializeCriticalSectionEx (M, 0, 0)
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65 #else
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66 #define hb_mutex_impl_init(M) InitializeCriticalSection (M)
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67 #endif
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68 #define hb_mutex_impl_lock(M) EnterCriticalSection (M)
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69 #define hb_mutex_impl_unlock(M) LeaveCriticalSection (M)
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70 #define hb_mutex_impl_finish(M) DeleteCriticalSection (M)
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73 #elif !defined(HB_NO_MT)
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75 #include <mutex>
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76 typedef std::mutex hb_mutex_impl_t;
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77 #define hb_mutex_impl_init(M) HB_STMT_START { new (M) hb_mutex_impl_t; } HB_STMT_END
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78 #define hb_mutex_impl_lock(M) (M)->lock ()
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79 #define hb_mutex_impl_unlock(M) (M)->unlock ()
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80 #define hb_mutex_impl_finish(M) HB_STMT_START { (M)->~hb_mutex_impl_t(); } HB_STMT_END
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83 #else /* defined(HB_NO_MT) */
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85 typedef int hb_mutex_impl_t;
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86 #define hb_mutex_impl_init(M) HB_STMT_START {} HB_STMT_END
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87 #define hb_mutex_impl_lock(M) HB_STMT_START {} HB_STMT_END
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88 #define hb_mutex_impl_unlock(M) HB_STMT_START {} HB_STMT_END
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89 #define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
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92 #endif
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95 struct hb_mutex_t
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96 {
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97 /* Create space for, but do not initialize m. */
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98 alignas(hb_mutex_impl_t) char m[sizeof (hb_mutex_impl_t)];
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99
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100 #pragma GCC diagnostic push
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101 #pragma GCC diagnostic ignored "-Wcast-align"
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102 void init () { hb_mutex_impl_init ((hb_mutex_impl_t *) m); }
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103 void lock () { hb_mutex_impl_lock ((hb_mutex_impl_t *) m); }
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104 void unlock () { hb_mutex_impl_unlock ((hb_mutex_impl_t *) m); }
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105 void fini () { hb_mutex_impl_finish ((hb_mutex_impl_t *) m); }
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106 #pragma GCC diagnostic pop
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107 };
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108
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109 struct hb_lock_t
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110 {
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111 hb_lock_t (hb_mutex_t &mutex_) : mutex (&mutex_) { mutex->lock (); }
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112 hb_lock_t (hb_mutex_t *mutex_) : mutex (mutex_) { if (mutex) mutex->lock (); }
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113 ~hb_lock_t () { if (mutex) mutex->unlock (); }
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114 private:
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115 hb_mutex_t *mutex;
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116 };
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117
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118
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119 #endif /* HB_MUTEX_HH */